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Senior Administrator Jobs (On-site work)

161 Job Offers

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Senior Systems Administrator
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Senior Systems Administrator needed for a long-term contract in Fort Mill, SC. Leverage 5+ years of expertise in Active Directory, Microsoft 365, Azure, and Hyper-V/VMware to support 400 users across 22 locations. This onsite role offers hands-on work with Windows Server, SharePoint migrations, a...
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United States , Fort Mill
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Not provided
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Robert Half
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Senior Administrator
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We are seeking a Senior Administrator to provide essential support to our Senior Leadership Team in Bordesley Green. This part-time role blends traditional and digital working, requiring strong organisational skills and discretion. Ideal candidates have PA or EA experience, with confidence in han...
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United Kingdom , Bordesley Green
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Not provided
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360 Resourcing Solutions
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Senior Administrator, Payroll
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Senior Payroll Administrator needed in Duluth, US. Audit multi-jurisdictional payroll data, correct pay errors, and provide expert customer service. Requires 3-5 years’ experience, strong Microsoft Office skills, and knowledge of HCM systems. Enjoy an employee assistance program and discount whil...
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United States , Duluth
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19.00 - 23.75 USD / Hour
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Chico's FAS, Inc.
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Senior Administrator, Payroll
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Senior Payroll Administrator needed in Fort Myers to lead multi-jurisdictional payroll processing with 3–5 years’ experience. You will audit timekeeping data, resolve pay discrepancies, and deliver exceptional customer service. Requires strong organizational skills, HCM expertise, and IRS tax kno...
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United States , Fort Myers
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19.00 - 23.75 USD / Hour
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Chico's FAS, Inc.
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Senior Systems Administrator (Linux)
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Senior Systems Administrator (Linux) sought to lead enterprise-level infrastructure for U.S. Navy operations in Waimea. Requires Top Secret clearance, RHCSA, and DoD 8570 IAT II certification. Manage RHEL environments, enforce RMF/NIST 800-53 compliance, and automate tasks using Bash, Python, and...
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United States , Waimea
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105000.00 - 145000.00 USD / Year
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Amentum
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Senior Contract Administrator
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Senior Contract Administrator role with a leading Tier 1 Australian infrastructure provider in Melbourne’s Northern Suburbs. Manage contract lifecycles, procurement, and cost optimization on large-scale utilities projects. Requires 6+ years’ experience, tertiary qualifications, and expertise in h...
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Australia , Melbourne
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Not provided
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Randstad
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Senior Administrator
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Senior Administrator role in Central London supporting construction and building services projects. Act as key liaison between internal teams and external contractors, managing documentation, compliance, and scheduling. Requires strong organisational skills, Microsoft Office proficiency, and prev...
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United Kingdom , City Of London
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15.00 GBP / Hour
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Office Angels
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Senior Administrator
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Seeking a proactive **Senior Administrator** for a permanent, full-time role at **HMP Oakwood** in Wolverhampton. You will provide vital administrative support in a fast-paced prison education environment. Requires Level 2 Literacy/Numeracy, strong IT skills, and experience with accurate data man...
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United Kingdom , Wolverhampton
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25877.80 - 27041.04 GBP / Year
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Novus
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Senior Business Administration Analyst
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Senior Business Administration Analyst sought by RGA, a Fortune 200 global reinsurance leader. Leverage your 4-5 years of financial industry experience and advanced skills in SQL, Python, and automation tools to streamline operational processes in Bangsar, Kuala Lumpur. Drive efficiency by optimi...
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Malaysia , Bangsar, Wilayah Persekutuan Kuala Lumpur
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Not provided
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Reinsurance Group of America
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Senior IT Support Administrator
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Senior IT Support Administrator sought for a permanent role in Athens’ northern suburbs with a leading pharmaceutical firm. Leverage 3+ years of experience in Active Directory, Azure, Microsoft 365, and Windows Server to maintain infrastructure, secure cloud services, and support daily operations...
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Greece , Athens
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Not provided
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Randstad
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Senior Contract Administrator
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Senior Contract Administrator role in Brisbane with a high-retention Tier 2 builder specializing in Education and Aged Care. You will own procurement, subcontract management, and mentor one CA on realistic, well-funded projects. Requires 4+ years in Australian commercial construction with proven ...
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Australia , Brisbane
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Not provided
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Randstad
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Senior System Administrator
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Senior System Administrator needed in Annapolis Junction, MD to support a government customer. Requires 15+ years of experience, expertise in Windows Server, Active Directory, Linux, and Broadcom VMware/ESXi. Key duties include system hardening, security compliance (Nessus/ACAS), and RMF. Must ho...
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United States , Annapolis Junction
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Not provided
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2HB
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Project Administrator (Senior Administrator)
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Senior Project Administrator sought for a leading Australian defence systems integrator in Adelaide’s northern suburbs. This role bridges finance, procurement, and technical delivery, requiring 5+ years’ experience in senior administration, advanced Excel, and ERP proficiency. You will manage pro...
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Australia , Adelaide
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85000.00 - 95000.00 AUD / Year
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Randstad
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Offsite Senior Medical Secretary-Obstetrics And Gynecology Administration-Mount Sinai West-Full-time day
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Seeking an experienced **Offsite Senior Medical Secretary** for **Mount Sinai West's OB/GYN Administration** in **New York**. This full-time day role requires 5+ years of administrative experience in a healthcare setting, handling high-volume phones, **OR scheduling**, **authorizations**, and **E...
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United States , New York
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Salary
29.94 - 32.08 USD / Hour
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Mount Sinai Health System
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Senior GP Education Administrator
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Senior GP Education Administrator needed in Swindon for a 12-month maternity cover, part-time role (20 hrs/week). Provide key administrative support to GP training programs, medical education, and CPD initiatives. Requires strong organizational skills, Microsoft Office proficiency, and relevant a...
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United Kingdom , Swindon
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28392.00 - 31157.00 GBP / Year
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Great Western Hospitals NHS Foundation Trust
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Senior Administrator
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Seeking a proactive **Senior Administrator** for a fixed-term maternity cover role at HMP Altcourse, Liverpool. This full-time position requires Level 2 Literacy/Numeracy, strong IT skills, and experience in a busy office environment. Join Novus to support a dynamic team, enjoying 35 days annual ...
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United Kingdom , Liverpool
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Salary
25877.80 - 27041.04 GBP / Year
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Novus
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Senior Administrator
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We are seeking a Senior Administrator for a client in Leith, Edinburgh. This hands-on role requires expertise in managing digital records, compliance systems, and GDPR. You will ensure smooth, compliant operations by maintaining personnel files and shared drives. Enjoy weekly pay, 28 days holiday...
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United Kingdom , Edinburgh
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Salary
18.13 GBP / Hour
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Office Angels
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Senior Administrator / Office Manager
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Senior Administrator / Office Manager needed in Lutterworth for a professional, team-oriented environment. You will support the SMT with audio and copy typing, report production, and meeting coordination. Advanced Excel and Word skills, exceptional attention to detail, and a proactive approach ar...
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Location
United Kingdom , Lutterworth
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Salary
30000.00 - 35000.00 GBP / Year
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Office Angels
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Senior Administrator - Finance Duties
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Senior Administrator – Finance Duties role in Wakefield, offering £18.10/hr for a 13-month maternity cover. Combine senior admin support with finance tasks like reconciliations, payments, and expenses. Ideal for an experienced, organised communicator; finance experience desirable but not essentia...
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Location
United Kingdom , Wakefield
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Salary
18.10 GBP / Hour
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Office Angels
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Clinic Patient Representative Senior - Administration
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Senior Clinic Patient Representative needed in Shreveport to manage patient check-in, scheduling, and insurance verification. Requires 3+ years healthcare experience, strong communication skills, and math proficiency. Preferred qualifications include ICD9/CPT coding, charge posting, and collectio...
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Location
United States , Shreveport
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Salary
Not provided
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CHRISTUS Health
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Until further notice
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About the Senior Administrator role

Senior Administrator jobs represent a critical tier of professional management and technical oversight within an organization. These roles are designed for experienced individuals who move beyond foundational tasks to assume responsibility for complex systems, strategic processes, and often, the mentorship of junior staff. A Senior Administrator acts as a cornerstone of operational stability, ensuring that the specific domain they oversee—whether technological, financial, or operational—functions securely, efficiently, and in alignment with broader business objectives.

The core of the profession involves a blend of deep technical or procedural expertise and advanced organizational leadership. Common responsibilities across various specializations include designing, implementing, and maintaining critical systems or processes; performing high-level troubleshooting and problem-solving for complex issues; and ensuring compliance with industry regulations and security protocols. Senior Administrators are typically tasked with ongoing optimization, conducting regular reviews and updates to enhance performance and reliability. They also play a key role in planning for future needs, managing upgrades, and contributing to strategic projects. Documentation, policy creation, and knowledge sharing are fundamental aspects of the role, as is providing training and guidance to other team members.

The skill set required for Senior Administrator jobs is both broad and deep. Employers universally seek candidates with several years of proven experience in their specific field, demonstrating a progression from junior to expert-level understanding. Technical proficiency with relevant platforms, software, or industry-specific tools is mandatory. Equally important are strong analytical and problem-solving abilities to diagnose and resolve intricate challenges. Senior roles demand excellent communication skills for liaising with stakeholders, vendors, and team members, and often require the ability to translate technical details into business impacts. Leadership qualities, such as project management, team mentorship, and a proactive approach to process improvement, are common differentiators. A keen attention to detail, a commitment to maintaining confidentiality and security, and the ability to work under pressure to meet deadlines are standard expectations across all senior administration jobs.

Ultimately, professionals in these positions are the trusted experts who ensure vital organizational infrastructure—be it IT networks, employee benefits schemes, or enterprise software environments—remains robust and responsive. They bridge the gap between high-level strategy and daily execution, making them indispensable assets in any sector. For those seeking a career marked by responsibility, expertise, and impact, exploring Senior Administrator jobs offers a pathway to a pivotal and respected professional role.

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